c#中关于backgroundWorker控件的用法

所需控件如下： 三个textbox，两个button，一个进度条，一个backgroundWorker控件 

 

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //设置计算按扭与取消按扭的使用属性以及进度条的进度值
            this.button1.Enabled = false;
            this.textBox3.Text = string.Empty;
            this.button2.Enabled = true;
            this.progressBar1.Value = 0;
            backgroundWorker1.RunWorkerAsync(new CalcInput(int.Parse(this.textBox1.Text), int.Parse(this.textBox2.Text)));//开始执行后台操作
        }

        //当执行后台操作时，后台线程开始执行此操作
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            CalcInput input = (CalcInput)e.Argument;
            //System.Threading.Thread.Sleep(5000);
            //e.Result = input.x + input.y;
            for (int i = 0; i < 10; i++)
            {
                System.Threading.Thread.Sleep(500);
                backgroundWorker1.ReportProgress(i * 10);
                if (backgroundWorker1.CancellationPending)
                {
                    e.Cancel = true;
                    return;
                }
            }
            e.Result = input.x + input.y;
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage; //设置进度条的value值
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            //this.textBox3.Text = e.Result.ToString();
            //this.button2.Enabled = true;
            //this.button1.Enabled = false;
            //this.progressBar1.Value = 100;
            if (e.Cancelled)
            {
                this.textBox3.Text = "cancelled";

            }
            else
            {
                this.textBox3.Text = e.Result.ToString();
            }
            this.button2.Enabled = true;
            this.button1.Enabled = false;
            this.progressBar1.Value = 100;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            backgroundWorker1.CancelAsync();//执行此操作时，需将backgroundWorker1控件WorkerSupportCancellation属性设置为true
        }
    }

//记录两个文本框的值
    public struct CalcInput
    {
        public CalcInput(int x, int Y)
        {
            this.x = x;
            this.y = Y;
        }
        public int x;
        public int y;
    }